37Mn5钢精炼过程夹杂物转变机理

doi:10.13228/j.boyuan.issn0449-749x.20190364

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Abstract The chemical compositions of non-metallic inclusions evolve during refining process and affect the performance of steel product.During the refining process of 37Mn5 steel production, the compositions of inclusions changed from Al₂O₃ to Al₂O₃-CaO-SiO₂-MgO-CaS, without calcium treatment. Samples were taken from 37Mn5 steel plant for inclusion analysis to study the mechanism of inclusion evolution.The results showed there was a significant difference between the compositions of larger inclusions and smaller ones. The changing tendencies during the refining process varied in inclusions with different size groups. The inclusions with diameters larger than 10 μm had similar compositions to the refining slag. Thus these inclusions were caused by slag entrapment or peeling off of slag building-up. 1.17% calcium was detected in Fe-Si alloy, which resulted in a similar effect to calcium treatment, as a big amount of small size CaS inclusions were formed in a short time.The analysis of compositions, amounts, and morphologies of inclusions, slag compositions, and thermodynamic calculation indicated that inclusions evoluted due to deoxidation, refractory corrosion, slag entrapment, reactions between calcium and liquid steel, reacted between inclusions and liquid steel, the mechanism of inclusion evolution during the refining process of 37Mn5 steel production was revealed.

Key words： 37Mn5 steel inclusion alloy slag entrapment

Received: 05 August 2019

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	WANG Yi
	ZHANG Li-feng
	REN Ying
	REN Qiang

Cite this article:

WANG Yi,ZHANG Li-feng,REN Ying等. Mechanism of inclusion evolution during refining process of 37Mn5 steel production[J]. Iron and Steel, 2020, 55(5): 39-44.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20190364 OR http://www.chinamet.cn/Jweb_gt/EN/Y2020/V55/I5/39

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